John brooks



(No Model.)

J. BR 0 0K S.

PRINTING PRESS.

No. 266,760. Patented Oct. 31, 1882.

UNITE STATES Arsnr FFIGEO JOHN BROOKS, OF PLAIN'FIELD, NEW JERSEY, ASSIGNOR TO HIMSELF AND O. POTTER, JR., 8K 00., OF NEW YORK, N. Y.

PRINTING-PRESS.

SPECIFICATION forming part of Letters Patent No. 266,760, dated October-31, 1882,

Application filed February 25, 1882.

(No model.)

To all whom it may concern Be it known that I, JOHN BROOKS, of Plainfield, in the county of Union and State of New Jersey, have invented an Improvement in Printing-Presses, of which the following is a specification.

In printing-presses that are usually known as two-revolution presses the impressioncylinder makes one revolution while the type 10 bed is moving in one direction and the other revolution while the type bed is moving the other way, and in order to be able to revolve the impression-cylinder continuously it is necessary to separate the impression-cylinder from IS the types. This has been done by raising the impression-cylinder during one revolution and lowering it during the next revolution; but the means employed for this purpose are complicated, occupy considerable space, and do not always insure a reliable raising-and-lowering movement. Hence the impression in printing is not always perfect in consequence of variations in the pressure upon the paper. I combine with the impression-cylimler and its jour- 2 nal-boxes two screws and nuts for the same, one at each side of the press, and mechanism for revolving such nuts automatically upon said screws as the bed terminates its stroke in one direction to lift the impressioneylinder o bodily, and for turning the nuts the other way to lower and hold down firmly the impressioncylinder as the bed terminates its stroke in the other direction.

In an application of like date herewith l have 5 described and more broadly claimed means for actuating the screw-nut by a longitudinallymoving rack. I do not therefore claim the same herein.

In the drawings, Figure l is a section of the 40 cylinder and an elevation of part of the frame and the mechanism for raising and lowering the journal-box of the impressioncylinder. Fig. 2 is an end elevation of the frame and elevation of the mechanism applied to the journal-box at one side of the press, and Fig. 3 is a sectional plan view at the line 0c 00.

The frame A is to be of any desired character. The impressioncylinder B and type-bed Care of usual construction. Thejournal-boxes D of the impression-cylinder are accurately 'volve once for every two revolutions of the imfitted to slide up and down in slotted hearings in the frame A, and to thejournal-boxes I) there are attached vertical screws a.

As the devices at the two sides of the frame are just alike, it will only be necessary to describe one of them, and to remark that the threads of the screws (0 should be one righthanded, the other lcft'handed, so that the devices that move the nuts I) may both be within the frames of the press; or the cams hereinat'- 6c ter described may be set to act in reverse directions. The nut b is made as a cylinder, with gear-teeth at 1, and this nut is within an opening in the frame below the crossbar 2 and above the rest 3 for the lower end of the nut. The screw (0 is by preference provided with a thread at the upper end, screwing into the bottom of the journal-box, and having a lock-nut, so that the parts may be adjusted, it necessary; but the lock'nut will hold the screw firmly, so 7:: that it cannot turn after being adjusted. It will now be evident thatif the nuts I) are turned one way as the bed completes its reciprocation in one direction the impression-cylinder will be raised and held up by the screws out of the way of the types as the bed returns, and that it the nuts are turned the other way the cyliin der is lowered and held down firmly while givingthe impression as the types move beneath it.

I do not claim screws and nuts for raising 8o theimpression-cylinder, as these,withonerackbar running across the press, have been used.

B yemploying separate rack-bars-one at each side -I am enabled to adjust the parts and insure greater accuracy. 8

The rack-bar d is made as a saddle to rest upon the stationary slider-bar c, that is made angling at the ends and bolted to the frame. This rack-saddle d has teeth at one side, that engage in the teeth 1 of the nut 1). At the 0 other side of the rack-saddle there is the barf, having slotted holes for the bolts 4, that bolt this bar f to the rack-saddle d, so that the locking-bar may be moved endwise before giving motion to the raclasaddle. 5

Upon the shaft l there is acannk, that gives motion to the link j and rocking lever i, and the upper end of this lever i is connected by the link it to the barf. The shaft Z should rc- ICO prcssion-cylinder B, and the cam thereon is so placed and shaped that it moves the leverz' in one direction as the bed 0 terminates its stroke in one direction and the other way as the bed finishes its stroke in the other direction, and thereby the barf and rack-saddle will be made to revolve the nuts and raise and lower the impression-cylinder alternately.

As a precaution against any inaccuracy of adjustment or tendency of any part to fail in performing its entire movement, I provide on the bar fthe two inclines 5 and 6, that stand in opposite directions, and I pivot a lockinglever, g, to the frame at 7, and connect to the same a rod, m, with a spring around it, which tends to draw down thelocking-lever g; and itis preferable to employ acylindrical stud or roller at the end of this locking-lever 9, so that as the rack-saddle completes its movement in one direction the round part of the lock-lever g will slide down behind the upper part of such rack-saddle, and not only look the parts, but insure the full movement of the rack-saddle endwise and the proper hold ofthe nut in keeping the impression-cylinder down in place. Upon the cam 79 moving the lever t' and bar f in the other direction, the incline 5 first lifts the lock-lever 9 out of contact with the raclc saddle, and after the bar f has given motion to the saddle and nut and raised the impression-cylinder the lock-lever end passes down behind the upper part of the rack-saddle, holding the parts firmly until they are again moved the other way. 7

A set-screw, 0, introduced in the frame below the lower end of each screw a, forms a stop in bringing down the impression-cylinder to its place previous to giving the impression.

I claim as my invention- 1. In a printing-press, the combination, with the impression-cylinder, its journal-boxes, and the screws connected with such journalboxes, of nuts for such screws within an opening in the frame of the machine, below the cross-bar 2 and above the rest 3, teeth upon the nuts, the rack-saddles d, and barsf, one at each side of the press and running longitudinally of the frame, and mechanism, substantially as described, for giving end motion to such racks, as set forth.

2. The combination, with the impressioncylinder and each of itsjournal-boxes, of the screw a, nut 12, racksaddle d, saddle-bar e, bar f, lock-lever g, and mechanism, substantially as described, for moving the lock-lever, substantially as set forth.

Signed by me this 18th day of February, 1882.

JOHN BROOKS.

\Vitnesses:

GEO. T. PINCKNEY, HAROLD SERRELL. 

